package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import lombok.SneakyThrows;
import model.UserInfo;
import util.AppVar;
import util.DBUtils;
import util.ResultUtils;
import util.SessionUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;

@WebServlet("/upart")
public class UpdateArticleServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        int data = 0;
        String msg = "未知错误";
        //登录权限效验
        UserInfo userInfo = SessionUtils.getLoginUser(req);
        if(userInfo != null){
            //先得到前端的值，并效验
            String title = req.getParameter("title");
            String context = req.getParameter("context");
            String aidStr = req.getParameter("aid");

            if(!StrUtil.isBlank(title) && !StrUtil.isBlank(context) && !StrUtil.isBlank(aidStr)){
                int aid = Integer.valueOf(aidStr);
                if(aid > 0){
                    //三个参数都有效
                    //执行数据库修改
                    Connection connection = DBUtils.getConnection();
                    String sql = "update article set title=?,context=? where aid=? and uid=?";
                    PreparedStatement statement = connection.prepareStatement(sql);
                    statement.setString(1,title);
                    statement.setString(2,context);
                    statement.setInt(3,aid);
                    statement.setInt(4,userInfo.getUid());
                    data = statement.executeUpdate();
                    //关闭资源
                    DBUtils.close(null,statement,connection);
                    msg = "";
                }
                else{
                    msg = "参数中id有误";
                }
            }
            else {
                msg = "参数不全！";
            }
        }
        else{
            msg = "请先登录!";
        }


        //返回给前端
        resp.setContentType(AppVar.RESPONSE_CONTENTTYPE_JSON);
        resp.getWriter().println(JSONUtil.toJsonStr(ResultUtils.toResult(200,data,msg)));
    }
}
